normally 5 times a day? What are you feeding him? He may just be constipated. You can maybe try giving him a little canned pumpkin. I find that really good at helping to relieve constipation and helpful in diarrhea cases as well. Make sure it's the can that says 100% pure pumpkin and not the stuff that says pumpkin pie filling.
I would keep an eye on him and if he still doesn't look like he's seeing any improvement then I'd check in with a vet.